Use your favorite headphones! The submini 2.5mm connector on the Hosa GMP467 3.5 mm to 2.5 mm Right-angle TRS Adaptor fits easily into Smartphones and MP3 players that use that pesky output jack that is slightly smaller than the standard 1/8 inch jack on the majority of consumer and professional headphones.
CALIFORNIA PROPOSITION 65 WARNING

WARNING: Cancer and Reproductive Harm -
www.P65Warnings.ca.gov.